import-js/eslint-plugin-import

Rule Proposal: No duplicate re-exports (no-duplicate-reexport)

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#773 opened on Mar 22, 2017

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 (5 comments) (1 reaction) (0 assignees)JavaScript (4,946 stars) (1,540 forks)batch import
help wantedrule proposal

Description

With such a rule, the following would be considered a problem

export {a} from './source-file'
export {b} from './source-file'
export {c} from './source-file'

The following would not be considered a problem

export {a, b, c} from './source-file'

Contributor guide

Tech stack
javascriptnodejs
Domain
tooling
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
basic JavaScriptESLint rule development
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70
Research direction
Review existing ESLint rules in the repository (e.g., in `src/rules/`) to understand the pattern for defining a rule with a `create` function that returns visitors. Use the ESLint AST to detect `ExportNamedDeclaration` nodes with a `source` property, and aggregate exports by source to flag duplicates. Check the issue comments for any discussed edge cases or preferred API. No linked PRs exist, so implement the rule from scratch, ensuring it handles both single and multiple exports from the same source file.